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| || *** DONE: Pics ***
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| || *** DONE: Pat's Blog ***
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| File:Albrecht Dürer self-portrait.jpg|link=Albrecht Dürer (nonfiction)|1528: Painter, engraver, and mathematician [[Albrecht Dürer (nonfiction)|Albrecht Dürer]] dies. Dürer is regarded as the greatest German Renaissance artist: his vast body of work will include altarpieces and religious works, numerous portraits and self-portraits, and copper engravings. | | File:Albrecht Dürer self-portrait.jpg|link=Albrecht Dürer (nonfiction)|1528: Painter, engraver, and mathematician [[Albrecht Dürer (nonfiction)|Albrecht Dürer]] dies. Dürer is regarded as the greatest German Renaissance artist: his vast body of work will include altarpieces and religious works, numerous portraits and self-portraits, and copper engravings. |
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| ||1551: Joachim Vadian dies ... physician, scholar, humanist, and politician. Pic.
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| File:Thomas_Bayes.gif|link=Thomas Bayes (nonfiction)|1749: Mathematician, philosopher, and crime-fighter [[Thomas Bayes (nonfiction)|Thomas Bayes]] uses statistical methods to predict and prevent [[crimes against mathematical constants]].
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| ||1749: Samuel Vince born ... clergyman, mathematician and astronomer at the University of Cambridge. Pic.
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| File:Supplice de 9 émigrés Octobre 1793.jpg|link=French Revolution (nonfiction)|1793: During the [[French Revolution (nonfiction)|French Revolution]], the Committee of Public Safety becomes the executive organ of the republic. | | File:Supplice de 9 émigrés Octobre 1793.jpg|link=French Revolution (nonfiction)|1793: During the [[French Revolution (nonfiction)|French Revolution]], the Committee of Public Safety becomes the executive organ of the republic. |
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| ||1801: William Miller born ... mineralogist and laid the foundations of modern crystallography. Miller indices are named after him, the method having been described in his ''Treatise on Crystallography'' (1839). Pic search yes: https://www.google.com/search?q=William+Hallowes+Miller
| | File:Niels_Henrik_Abel.jpg|link=Niels Henrik Abel (nonfiction)|1829: Mathematician and theorist [[Niels Henrik Abel (nonfiction)|Niels Henrik Abel]] dies. Abel made pioneering contributions in a variety of fields, including the discovery of Abelian functions, and the first complete proof demonstrating the impossibility of solving the general quintic equation in radicals. |
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| ||1810: Philip Henry Gosse born ... biologist and academic ... Aquaria. Pic.
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| File:Niels_Henrik_Abel.jpg|link=Niels Henrik Abel (nonfiction)|1829: Mathematician and theorist [[Niels Henrik Abel (nonfiction)|Niels Henrik Abel]] dies. Abel made pioneering contributions in a variety of fields, including the discover of Abelian functions, and the first complete proof demonstrating the impossibility of solving the general quintic equation in radicals. | |
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| ||1851: Guillaume Bigourdan dies ... astronomer and academic. Pic.
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| ||1852: Edward Sabine announced that the 11 year sunspot cycle was "absolutely identical" with the geomagnetic cycle. Later, using a larger dataset, Rudolf Wolf confirmed this fact. Since Newton's explanation of the effect of the sun's gravity on earth, this was the first new phenomenon of the sun interacting with the earth. Thus began continuing studies of the solar-terrestrial activity. https://pballew.blogspot.com/2019/04/on-this-day-in-math-april-6.html Pic.
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| ||1864: William Bate Hardy born ... biologist, food scientist, and academic. Pic.
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| ||1869: Celluloid is patented.
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| ||1886: Walter Dandy born ... physician and neurosurgeon. Pic.
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| File:Pieter Rijke.jpg|link=Pieter Rijke (nonfiction)|1889: Physicist and crime-fighter [[Pieter Rijke (nonfiction)|Petrus Leonardus Rijke]] invents the Rijke tube, which neutralizes [[Crimes against physical constants|crimes against audio constants]] by creating a self-quantumizing standing wave.
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| ||1890: André-Louis Danjon born ... astronomer who devised a now standard five-point scale for rating the darkness and colour of a total lunar eclipse, which is known as the Danjon Luminosity Scale. He studied Earth's rotation, and developed astronomical instruments, including a photometer to measure Earthshine - the brightness of a dark moon due to light reflected from Earth. It consisted of a telescope in which a prism split the Moon's image into two identical side-by-side images. By adjusting a diaphragm to dim one of the images until the sunlit portion had the same apparent brightness as the earthlit portion on the unadjusted image, he could quantify the diaphragm adjustment, and thus had a real measurement for the brightness of Earthshine.*TIS Pic search yes: https://www.google.com/search?q=André-Louis+Danjon
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| ||1890: Anthony Fokker born ... engineer and businessman, founded Fokker Aircraft Manufacturer. Pic.
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| ||1892: Donald Wills Douglas, Sr. born ... engineer and businessman, founded the Douglas Aircraft Company. Pic.
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| ||1903: Harold Eugene Edgerton born ... engineer and academic. Pic.
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| ||1908: Valentine "Valya" Bargmann born ... mathematician and theoretical physicist. Pic.
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| ||1911: Feodor Felix Konrad Lynen born ... biochemist and academic, Nobel Prize laureate. Pic.
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| ||1913: Adolf Slaby dies ... electronics pioneer. Pic.
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| ||1913: Otto Schmitt born ... inventor, engineer, and biophysicist known for his scientific contributions to biophysics and for establishing the field of biomedical engineering. Schmitt also coined the term biomimetics and invented the Schmitt trigger, the cathode follower, the differential amplifier, and the chopper-stabilized amplifier. Pic search yes: https://www.google.com/search?q=Otto+Schmitt+inventor
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| ||1920: Julius Elster dies ... teacher and physicist. He and Hans Friedrich Geitel invented the photocell. Pic search good: https://www.google.com/search?q=Julius+Elster
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| ||1920: Jack Cover born ... pilot and physicist, invented the Taser gun. Pic.
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| ||1922: 1922 Emmy Noether named “unofficial associate professor” at Gottingen. This purely honorary position reveals the strong prejudice of the day against women. [DSB 10, 138 and A. Dick, xiii.] Thony Christie sent me a note that says "In 1922 Emmy Noether was appointed 'außerordentliche Professur' which is not an 'unofficial associate professor' but is an official professorial post without a chair. " Thanks, Thony https://pballew.blogspot.com/2019/04/on-this-day-in-math-april-6.html
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| File:Gil Kane.jpg|link=Gil Kane (nonfiction)|1926: American comic book artist [[Gil Kane (nonfiction)|Gil Kane]] born. Kane will pioneer graphic novels with his books ''His Name is...Savage'' (1968) and ''Blackmark'' (1971). | | File:Gil Kane.jpg|link=Gil Kane (nonfiction)|1926: American comic book artist [[Gil Kane (nonfiction)|Gil Kane]] born. Kane will pioneer graphic novels with his books ''His Name is...Savage'' (1968) and ''Blackmark'' (1971). |
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| ||1930: Gandhi raises a lump of mud and salt and declares, "With this, I am shaking the foundations of the British Empire," beginning the Salt Satyagraha. Pic.
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| ||1938: 1938 DuPont researcher Roy Plunkett and his assistant, Jack Rebok, discovered polytetrafluoroethylene, the slipperiest man-made substance. Teflon became a household word in 1960 when Teflon-coated frying pans were introduced. The Manhattan Project used it in producing Uranium-235, for it was the only gasket material that would contain the corrosive hexaflouride. https://pballew.blogspot.com/2019/04/on-this-day-in-math-april-6.html
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| ||1942: Bradley Allen Fiske dies ... officer in the United States Navy who was noted as a technical innovator. During his long career, Fiske invented more than a hundred and thirty electrical and mechanical devices, with both naval and civilian uses, and wrote extensively on technical and professional issues; The New Yorker called him "one of the notable naval inventors of all time." One of the earliest to understand the revolutionary possibilities of naval aviation, he wrote a number of books of important effect in gaining a wider understanding of the modern Navy by the public. Pic.
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| ||1944: Rose O'Neill dies ... cartoonist, illustrator, artist, and writer. Pic.
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| ||1952: Rudolf Walter Ladenburg dies ... atomic physicist. Pic.
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| ||1961: Jules Bordet dies ... microbiologist and immunologist, Nobel Prize laureate. Pic.
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| ||1963: Otto Struve dies ... astronomer and academic. Pic.
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| ||1965: Launch of Early Bird, the first commercial communications satellite to be placed in geosynchronous orbit.
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| ||1972: Vietnam War: Easter Offensive: American forces begin sustained air strikes and naval bombardments.
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| ||1973: Launch of Pioneer 11 spacecraft.
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| ||1985: André Néron dies ... mathematician at the Université de Poitiers who worked on elliptic curves and Abelian varieties. He discovered the Néron minimal model of an elliptic curve or abelian variety, the Néron differential, the Néron–Severi group, the Néron–Ogg–Shafarevich criterion, the local height and Néron–Tate height of rational points on an Abelian variety over a discrete valuation ring or Dedekind domain. Pic: https://ceppp.ca/en/ceppp-andre-neron-1000x1000px/
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| File:Isaac Asimov.jpg|link=Isaac Asimov (nonfiction)|1992: Writer [[Isaac Asimov (nonfiction)|Isaac Asimov]] dies. Asimov is one of the "Big Three" science fiction writers of his generation. | | File:Isaac Asimov.jpg|link=Isaac Asimov (nonfiction)|1992: Writer [[Isaac Asimov (nonfiction)|Isaac Asimov]] dies. Asimov is one of the "Big Three" science fiction writers of his generation. |
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| ||1997: Physicist Joaquin Mazdak Luttinger dies ... known for his contributions to the theory of interacting electrons in one-dimensional metals (the electrons in these metals are said to be in a Luttinger-liquid state) and the Fermi-liquid theory. Pic.
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| ||1998: Pakistan tests medium-range missiles capable of reaching India.
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| File:Anita Borg.jpg|link=Anita Borg (nonfiction)|2003: Computer scientist [[Anita Borg (nonfiction)|Anita Borg]] dies. She founded Anita Borg Institute for Women and Technology.
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| ||2004: Alexander Yakovlevich Lerner dies ... scientist and Soviet refusenik. Cybernetics. Pic: https://ru.wikipedia.org/wiki/%D0%9B%D0%B5%D1%80%D0%BD%D0%B5%D1%80,_%D0%90%D0%BB%D0%B5%D0%BA%D1%81%D0%B0%D0%BD%D0%B4%D1%80_%D0%AF%D0%BA%D0%BE%D0%B2%D0%BB%D0%B5%D0%B2%D0%B8%D1%87
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| ||2012: Fang Lizhi dies ... Chinese astrophysicist and activist whose liberal ideas inspired the pro-democracy student movement of 1986–87 and, finally, the Tiananmen Square protests of 1989. Pic.
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| File:Robot 7.jpg|link=Robot 7 (nonfiction)|2016: ''[[Robot 7 (nonfiction)|Robot 7]]'' voted Picture of the Day by the citizens of [[New Minneapolis, Canada]].
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| </gallery> | | </gallery> |
